Origins
What is the origin of sound?
Compare the speed of light and sound.
Light far more quickly compared to sound
What differs across the electromagnetic spectrum?
The frequency and/or wavelength of the waves
What must be present for sound to travel?
A medium!
What is light?
Energy
What do scientists agree concerning the nature of light?
That it has a dual nature, part particle and part wave.
What is the speed of light in a vacuum?
300,000 km/s
What is an electromagnetic wave?
Energy wave that is partly electric and partly magnetic.
What is the source of sound?
Sound is compressions and rarefactions in a medium.
How do we know that light is both a particle and wave?
Light can act like both based on the circumstances.
What did ancient philosophers think light consisted from?
Particles entering the eye or streamers being emitted from it.
What is the speed of sound in air?
340 m/s
Why are some electromagnetic waves dangerous to humans and others are harmless?
Their energy increases with frequency.
Explain how a humid warm day would affect sound.
Sound will travel more quickly due to increased temperature and density.
What makes something transparent?
Materials that transmit light without absorbing the energy are transparent.
What is the ONLY thing we see?
What three variables effect the speed of sound?
Mass, temperature, and elasticity
What form of electromagnetic wave is found on either side of visible light?
Which has higher and lower frequency?
Which causes DNA damage?
Infrared - lower frequency
Ultraviolet - higher frequency, causes damage
What is the difference between sound intensity and loudness?
How much more intense would a 75 dB scream be compared to a 25 dB whisper?
105 (100,000x more intense)
The energy received by the atom can either...(2 options)
(1) pass to neighboring atoms by collisions
(2) reemitted as light.
Explain why light travels more slowly in translucent objects.
There is time delay between absorption and reemission of light between atoms.
List ALL of the electromagnetic waves in order of increasing frequency.
Radio Waves, Microwaves, Infrared, Visible light, Ultraviolet, X-Rays, Gamma Rays
Explain what would be required to make the loudest room possible and quietest room. You must include three aspects for each room.
Loudest:
1. Reflective Surfaces, 2. Enclosed Shape 3. Mixer for no standing waves
Quietest:
1. Absorption Surfaces 2. Sound Isolation 3. Eliminate Background Noise
Explain how Olaus Roemer first determined that light as a finite speed.
The difference in time of eclipse of Jupiter's moon due to the difference in distance shows that speed of light is finite.